Download Electricity and Magnetism Review Name: Directions: Answer the

Electricity and Magnetism Review
Name: ______________________
Directions: Answer the following questions using your blue notes and practice problems.
1. Current electricity is the continuous flow of electrons through a conductor.
2. Materials that are a cross between conductors and insulators such as diodes and transistors
are called semiconductors.
3. _____static electricity____ is the buildup of electrons on an object.
4. The interactions/properties of magnets is referred to as ___magnetism_____.
5. ____electroscope______ is an instrument used to detect electric charge.
6. Objects that do not allow electrons to flow easily are called ____insulators__.
7. __magnetic field_____ is the area of force surrounding a magnet.
8. _induction__ is the transfer of electrons without contact.
9. Objects that allow electrons to flow easily are called ___conductors_____.
10. When electrons travel in the same direction it is called ___direct current.
11. The ___switch_________ open and closes the circuit.
12. ___friction___ is the transfer of electrons by rubbing two objects together.
13. Alternating current is when electrons move back and forth as it flows.
14. A complete, closed path in which electrons only have one path to follow is called a
____series__ circuit.
15. ___conduction__ is the transfer of electrons through certain metals.
16. __electromagnetism__ is the relationship between electricity and magnetism. (We used a
battery, wire, and a nail to show an example.)
17. Where is a magnet the strongest? At the poles
18. What do opposite electric charges or magnetic poles do when brought close to one another?
attract
19. Electric motors convert electrical energy into mechanical energy.
20. ___grounding (ground wires)__ directs electric charges to the ground.
21. Generators convert mechanical energy into electricity energy.
22. How can you increase the strength of an electromagnet?
Use a bigger nail, wrap more coils of wire around the nail, use more/bigger batteries
23. What is the loss of static electricity called? Give an example.
Static or electric discharge; lightning, getting shocked after shuffling across a carpet then
touching a door knob
24. How can you destroy a magnet? With lots of force or with heat
25. How are electricity and magnetism related?
They both have fields, they follow the same rules for attraction, they can create each other
26. Label the following as series or parallel circuits
A. ____series__
B. ____parallel____
27. Label the following as either magnetic or nonmagnetic.
A. ___nonmagnetic_
B. ____magnetic__
FORMULAS:
Power = current X voltage
Cost = energy X unit cost
(the price)
28. What is the current of an appliance that operates with a voltage of 110 V and a resistance
of 10 ohms? I = V/R
I= 110V/10Ω
I = 11 amps
29. How much power is delivered when a source of 120V sends 5 A to an appliance?
P= I x V
P = 120 V x 5 A
P = 600 watts
30. If you use 1800kWh this month, how much will you electric bill be if each kWh cost $0.09?
Cost = 1800kWh X $0.09
Cost = $162.00